Genomic feature
Transcription Start site
Transcription start site
The DNA position where RNA polymerase begins synthesizing a particular RNA transcript.
Overview
EXPLORE BY LEVELThe transcription start site is the DNA position where the RNA copy begins. A promoter helps the cell position the machinery that starts copying there.
Quick Facts
AT A GLANCEKey ideaDefines the beginning of a transcript
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All 2 Structured Connections
Recommended Reading
Trusted references for learning more about Transcription Start site.
Research Claims
TSS usage is often distributed across a promoter region rather than a single invariant base. Cell-specific initiation and transcript annotation determine which start sites are active and how they are reported.